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		No cover image available El bosque y la conservación del suelo : su importancia cultural y económica / Helmuth O. Wagner y Hans Lenz. by Wagner, Helmuth O \| Lenz, Hans [coaut.]. Series: Biblioteca enciclopédica popular. 3a. época ; 212.Material type: Text; Format: print ; Literary form: Not fiction Publication details: México : SEP, 1949Availability: Not available: Coleccion SEP (3).
		No cover image available El papel indígena mexicano by Lenz, Hans. Material type: Text; Literary form: Not fiction Availability: Not available: Coleccion SEP (1).